It sounds ike you're having a reaction for something (sounds scary but you might have some kind of poisoning) maybe something in the air (pesticide or some crap like that), or maybe you are getting migrane (regulary caused by being very sensible to some food like milk, chocolate, lemon and some nuts).

If this keeps going one more day I'll advice you to go to a doctor and have that checked, have in mind the specific situations in wich the pain started and what you did the days before (ate, drank, being around some place you don't usually go, etc) so the doc has a better perspective bout your problem.

Get well bro, so you can still Rock on. :D